What's New: Microsoft: Not Patch's Fault

Microsoft says they have identified at least one cause of the STOP errors plaguing some Windows XP users after this week's updates: a malicious rootkit known as TDSS. The malware infects a system disk driver file named atapi.sys, which crashes after the new update makes changes in Windows' operating system kernel. If the file cannot function, or is removed, Windows cannot boot. Instead, users must disinfect their systems before installing the update.